The only fraud charged by the answer, in an action by real estate agents for commissions for trading defendant's land being that plaintiffs were in the employ of the other party to the trade when they were employed by defendants, which fact of dual employment plaintiffs by their reply admitted and justified on the ground that it was with the knowledge and consent of both parties, defendants cannot avail themselves of the defense that plaintiffs acted in bad faith toward both parties by each attempting to testify as to the value of the land of the other. Cook v. Platt, 126 Mo. App. 553, 104 S. W. 1131.